Eevee shadow inaccuracy
The Eevee &quot;Contact Shadows&quot; setting may help.  With the rendering engine set to Eevee, go to the light parameters for the light source casting the shadow.  There will be a &quot;Shadow -&gt; Contact Shadows&quot; checkbox you can turn on, plus some settings you may need to adjust to get a good merge between the contact shadow and the other shadows.
Here's an example, with and without contact shadows turned on:
No contact:

With contact: